Solution :
Mean = = X * P(X)
= 1 * 0.10+ 5*0.30 + 9 * 0.60
= ( 0.10+ 1.5 +5.4 )
= 7
variance= 2
=X 2 * P(X) - 2
= [ 12 * 0.10+ 52*0.30 + 92 * 0.60]-72
= [( 0.10+7.5 +48.6) )]-49
=56.2-49
2=7.20
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